Commit 1884c283 authored by Finn Thain's avatar Finn Thain Committed by Martin K. Petersen
Browse files

ncr5380: Correctly clear command pointers and lists after bus reset 



Commands subject to exception handling are to be returned to the scsi
mid-layer. Make sure that the various command pointers and command lists
in the low-level driver are correctly cleansed of affected commands.

This fixes some bugs that I accidentally introduced in v4.5-rc1 including
the removal of INIT_LIST_HEAD for the 'autosense' and 'disconnected'
command lists, and the possible NULL pointer dereference in
NCR5380_bus_reset() that was reported by Dan Carpenter.

hostdata->sensing may also point to an affected command so this pointer
also has to be cleared. The abort handler calls complete_cmd() to take
care of this; let's have the bus reset handler do the same.

The issue queue may also contain an affected command. If so, remove it.
This also follows the abort handler logic.

Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Fixes: 62717f53 ("ncr5380: Implement new eh_bus_reset_handler")
Tested-by: default avatarMichael Schmitz <schmitzmic@gmail.com>
Cc: <stable@vger.kernel.org> # 4.5
Signed-off-by: default avatarFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent c6fff322

drivers/scsi/NCR5380.c

+12 −7
Original line number Diff line number Diff line
@@ -2450,7 +2450,16 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) 
	 * commands!

	 */



	if (list_del_cmd(&hostdata->unissued, cmd)) {

		cmd->result = DID_RESET << 16;

		cmd->scsi_done(cmd);

	}



	if (hostdata->selecting) {

		hostdata->selecting->result = DID_RESET << 16;

		complete_cmd(instance, hostdata->selecting);

		hostdata->selecting = NULL;

	}



	list_for_each_entry(ncmd, &hostdata->disconnected, list) {

		struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
@@ -2458,6 +2467,7 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) 
		set_host_byte(cmd, DID_RESET);

		cmd->scsi_done(cmd);

	}

	INIT_LIST_HEAD(&hostdata->disconnected);



	list_for_each_entry(ncmd, &hostdata->autosense, list) {

		struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
@@ -2465,6 +2475,7 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) 
		set_host_byte(cmd, DID_RESET);

		cmd->scsi_done(cmd);

	}

	INIT_LIST_HEAD(&hostdata->autosense);



	if (hostdata->connected) {

		set_host_byte(hostdata->connected, DID_RESET);
@@ -2472,12 +2483,6 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) 
		hostdata->connected = NULL;

	}



	if (hostdata->sensing) {

		set_host_byte(hostdata->connected, DID_RESET);

		complete_cmd(instance, hostdata->sensing);

		hostdata->sensing = NULL;

	}



	for (i = 0; i < 8; ++i)

		hostdata->busy[i] = 0;

#ifdef REAL_DMA

drivers/scsi/atari_NCR5380.c

+12 −7
Original line number Diff line number Diff line
@@ -2646,7 +2646,16 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) 
	 * commands!

	 */



	if (list_del_cmd(&hostdata->unissued, cmd)) {

		cmd->result = DID_RESET << 16;

		cmd->scsi_done(cmd);

	}



	if (hostdata->selecting) {

		hostdata->selecting->result = DID_RESET << 16;

		complete_cmd(instance, hostdata->selecting);

		hostdata->selecting = NULL;

	}



	list_for_each_entry(ncmd, &hostdata->disconnected, list) {

		struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
@@ -2654,6 +2663,7 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) 
		set_host_byte(cmd, DID_RESET);

		cmd->scsi_done(cmd);

	}

	INIT_LIST_HEAD(&hostdata->disconnected);



	list_for_each_entry(ncmd, &hostdata->autosense, list) {

		struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
@@ -2661,6 +2671,7 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) 
		set_host_byte(cmd, DID_RESET);

		cmd->scsi_done(cmd);

	}

	INIT_LIST_HEAD(&hostdata->autosense);



	if (hostdata->connected) {

		set_host_byte(hostdata->connected, DID_RESET);
@@ -2668,12 +2679,6 @@ static int NCR5380_bus_reset(struct scsi_cmnd *cmd) 
		hostdata->connected = NULL;

	}



	if (hostdata->sensing) {

		set_host_byte(hostdata->connected, DID_RESET);

		complete_cmd(instance, hostdata->sensing);

		hostdata->sensing = NULL;

	}



#ifdef SUPPORT_TAGS

	free_all_tags(hostdata);

#endif

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